Cosmetic and deodorant sticks



States COSMETIC AND DEODORANT STICKS N Drawing. Application =March 1,:1956

Serial No. 568,938

7 Claims. '(Cl. 167-90) The present invention relates to a cosmeticstick, and more particularly to adeodorant stick, comprising a solidalcohol base and having dispersed therein a water-soluble soap or saltof saturated higher fatty acids having essentially 12 to 14 carbonatoms, as hereinafter described and claimed.

Cosmetic preparations in the form of solid, stick or frozen colognes arewell known in the art. In general, such products have comprised usuallya major amount of alcohol with a minor amount of solidifyingingredients. It has been proposed to incorporate deodorant materials insuch products also.

In accordance with the present invention, it has been discovered that acosmetic stick comprising a solid alcohol base and having dispersedtherein a minor amount of a water-soluble soap or salt of saturatedhigher fatty acids having essentially 12 to 14 carbon atoms exhibitscertain desirable characteristics. A preferred embodiments relates to adeodorant stick comprising a major amount of alcohol solidified by aminor amount of sodium stearate, a deodorant and having incorporatedtherein a minor-amount of a lower alkylolamine soap 'or salt of saidhigher fatty acids. Other significant features and preferred embodimentswill be apparent from the following description.

This novel cosmetic stick exhibits many beneficial and uniquecharacteristics. The product has effective deodorant properties andexcellent yielding qualities with rapid drying upon application to theskin without irritation. The user experiences a moist feeling andcooling sensation. As to the physical characteristics of the productitself, it is transparent when freshly made and results in a cleartranslucent gel system upon aging. It is stable and withstands summertemperatures with minimum shrinking and without the development oftackiness or syneresis.

As indicated, the specified water-soluble soap. or salt is an essentialingredient of a composition having the above characteristics. The termssoap and salt as used herein are synonymous. Suitable examples are thealkali metal (e.g. sodium and potassium) and nitrogencontaining salts ofsaid fatty acids. Examples of the nitrogen-containing salts are theammonium and lower alkylolamine salts having 2 to 3 carbon atoms peralkylol group, such as the monoethanolamine, tri-ethanolamine,monopropanolarnine, monoand tri-isopropanolamine salts. The acidicportion of the salts. should be essentially pure saturated higher fattyacids such as lauric or myristic acids, or suitable mixtures thereofderived from waxy or fatty materials provided that it is free fromsignificant proportions of other fatty acids of higher or lowermolecular weight which substantially adversely affect or neutralize thedesired etfects. For example, selective fractionation of the fatty acidsderived from the saponification and hydrolysis of lanolin may beconducted in known manner so as to obtain a fraction which is composedessentially of 14 carbon fatty acid, e.g. myristic acid. A

typical commercial material which has given excellent results analyzesas essentially the tri-isopropanolamine salt of myristic acid. Uponhydrolysis, the fatty acid fraction has the following characteristics:Neutral equiv. 232.5, M.-P. 52 C., distills in the form of the methylesters under 2 mm. vacuum with 218% at 102104 C., 90.8% at 127-128 C.and 6.4% at 150 C. This material is utilized conveniently in the form ofa transparent pasty concentrated-aqueous gel. Other suitable materialsare potassium myristate, mono-isopropanolamine myristate,triethanolamine myristate, tri-isopropanolamine laurate and the like.

It has been found that the specified salt material is compatible in analcohol base solidified or gelled with a hard soap such as sodiumstearate. It does not cloud nor tend to precipitate from the gel systemof the stick. As part of its beneficial effects, this salt reduces theyield point of'the cosmetic-stick significantly which is the minimum orinitial pressure required to initiate flow in this plastic or gel-likesystem. The lowered yield point gives a greater slip as the product isapplied to the skin, resulting in the deposition of a smooth, even andnon-tacky coating without drag. Where deodorant is present in theproduct, the presence of the alkylolamine myristate salt or the likeinsures the application of a suificient and uniform quantity of thedeodorant to the skin without irritation. Such salt is essential inpreventing excessive tackiness in the product and is conducive also tothe obtention of a stable, translucent product With minimum shrinkingupon aging or subjection to elevated temperatures. It is preferred toemploy a lower alkylolamine salt of myristic acid in view-of the optimumeffects obtained thereby.

This salt should be used in minor proportion, such as from about /2 to5%, and preferably from 1 to 3% by weight, of the composition asformulated since it has been found that within this range the finishedproduct possesses the desired properties to an optimum degree.

The'alcohol is present as the major component of the composition andvaries usually from about 70 to by weight. The alcohol has 2 to 3 carbonatoms usually, with ethyl alcohol preferred in'particular thoughisopropyl alcohol may be used 'also.

The alcohol is converted into a gel with a solidifying ingredient inknown manner to form the solid cosmetic product. In particular,itis'preferred to employ a stearic acid soap as the gelling agent whichis formedipreferably in situ by the admixture of alkali such as sodiumhydroxide with a warm solution of stearic acid in alcohol. The resultingmixture solidifies to a. gel upon cooling. Any type ofstearic acid maybe used through it is. preferred to employ the commercialstearicacidwhich comprises essentially "a mixture 'of-stearic =and palmitic acids.

Other :materials -capable of solidifying the alcohol "are known in theart and may be employed in the present invention, such as waxes, e.g.candelilla and carnauba waxes.

The solidifying material is used in a minor but variable amount and willbe from about 210%, preferably 48%, by weight of the formulationdepending upon the specific solidifying agent, such as sodium stearate.The admixture of the water-soluble salt of said higher fatty acid Withsodium stearate or the like has been found to be the preferredcombination for obtention of the desired efiiects.

Any suitable deodorant material may be incorporated in the product.There is a wide variety of recognized deodorant materials such as thehalogenated dihydroxy diphenyl methanes. Specific examples are the 2,2dihydroxy derivatives such as 2,2-dihydroxy-3,5,6-3',5,6'-hexachlorodiphenylmethane (hexachlorophene) and the corresponding alkalimetal, e.g. sodium, and alkaline earth metal, e.g. calcium, salts. Othermaterials including anti-bacterial agents and anti-perspirants may beemployed in the product similarly. Such materials including deodorantcompounds are employed usually in minor amount, such as from about 0.05to 5%, and preferably 0.01 to 1%, by weightdepe'nding upon theparticular material.

Various optional materials may be incorporated in suitable amount intheproduct such as a small amount of moisture, glycerine, carbitol,perfumes, coloring agents and the like as desired.

The following specific examples are further illustrative of the presentinvention, but it is to be understood that the invention is not limitedthereto. All amounts of the various ingredients are by weight unlessotherwise specified.

Example I A deodorant stick is prepared according to the followingformulation Percent Tri-isopropanolamine myristate 1.5 Ethyl alcohol(95%) 80.0

The composition is prepared by mixing alcohol, carbitol, glycerine, thedeodorant (hexachlorophene) and the alkylolamine salt with an alcoholicsolution of the stearic acid at 160 F. to form a homogeneous mixture.The sodium hydroxide is added to the heated mixture in order togradually saponify the stearic acid in situ, followed by the addition ofthe perfume and color. The mixture is poured at a temperature of 140-145F. into cylindrical molds and permitted to solidify upon cooling. Uponremoval from the molds, the finished products are each in cylindricalform suitable for individual use due to the form of the molds.

It is stable and possesses effective deodorant qualities combined withease of application and low yield point, and the other desiredattributes as described.

Example II A suitable cosmetic stick is prepared as in Example I exceptthat the hexachlorophene deodorant is omitted. The finished product is ahighly translucent, stable cologne stick which yields freely uponapplication to the skin as the product of Example I.

Examples III-VII Satisfactory deodorant sticks are prepared as inExample I except that the tri-isopropanolamine myristate is substitutedby equivalent amounts of triethanolamine myristate,mono-isopropanolamine myristate, triisopropanolamine laurate, sodium andpotassium myristate.

Although the present invention has been described and illustrated with areference to specific examples, it is understood that modifications andvariations of composition and procedure are contemplated within thescope of the appended claims.

Having thus described the invention, what is claimed is:

1. A deodorant cosmetic stick comprising a gel of a major amount ofalcohol of 2 to 3 carbon atoms and a minor amount of sodium stearatesutiicient to solidify said alcohol to a solid gel, a deodorant, andhaving incorporated therein about /2 to 5% by weight of a watersolublesoap of myristic acid effective to improve the yielding properties ofsaid stick.

2. A deodorant stick in accordance With claim 1 which contains ethylalcohol.

3. A deodorant stick in accordance with claim 1 wherein said deodorantis 2,2'-dihydroxy-3,5,6-3,5',6' hexachlorodiphenylmethane.

4. A deodorant stick in accordance with claim 1 wherein saidWater-soluble soap is essentially an alkylolamine soap of myristic acid.

5. A deodorant stick in accordance with claim 4 wherein said soap istri-isopropanolarm'ne myristate.

6. A cosmetic stick comprising a gel of a major amount of alcohol of 2to 3 carbon atoms and a minor amount of sodium stearate sufficient tosolidify said alcohol to a solid gel, and having incorporated thereinabout /2 to 5% by weight of a water-soluble soap of a saturated fattyacid having essentially 12 to 14 carbon atoms effective to improve theyielding properties of said stick.

7. A cosmetic stick comprising a gel of a major amount of alcohol of 2to 3 carbon atoms and a minor amount of sodium stearate suflicient tosolidify said alcohol to a solid gel, and having incorporated thereinabout /2 to 5% by weight of a water-soluble soap of myristic acideffective to improve the yielding properties of said stick.

References Cited in the file of this patent UNITED STATES PATENTSEmulsion: Carbide and Carbon Chem. Corp., N.Y.C., 8th ed., 1949, pp.7-9.

De Navarre: Am. Perf. and Ess. Oil Rev., vol. 56, October 1950, pp.289-291.

Martin: Modern Soap and Detergent Ind, The Tech. Press, London, vol. 2,1951, see. H, pp. 67-75.

Wertheim: Textbook of Organic Chem., The Blakiston Co., Phila., 2nd ed.,1945, pp. 215, 216, 218-220.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION August 18, 1959Patent No. 2,900,306

Joseph Nelson Slater e printed specification appears in th d that thesaid Letters It is hereby certified that error correction an of theabove numbered patent requiring Patent should read as corrected below.

Column 3, line 5, for "0.01 to 1%, by Weight" read 0,1 to 1%, by weight.Signed and sealed this 16th day of February 1960.,

(SEAL) Attest:

F INE KARL H AXL ROBERT C. WATSON Commissioner of Patents AttestingOflicer

1. A DEODORANT COSMETIC STICK COMPRISING A GEL OF A MAJOR AMOUNT OFALCOHOL OF 2 TO 3 CARBON ATOMS AND A MINOR AMOUNT OF SODIUM STEARATESUFFICIENT FO SOLIDIFY SAID ALCOHOL TO A SOLID GEL, A DEODORANT, ANDHAVING INCORPORATED THEREIN ABOUT 1/2 TO 5% BY WEIGHT OF A WATERSOLUBLESOAP OF MYRISTIC ACID EFFECTIVE TO IMPROVE THE YIELDING PROPERTIES OFSAID STICK.